diff --git a/src/Microdown-BookTester/MicFigureCaptionChecker.class.st b/src/Microdown-BookTester/MicFigureCaptionChecker.class.st
new file mode 100644
index 000000000..d68f9723d
--- /dev/null
+++ b/src/Microdown-BookTester/MicFigureCaptionChecker.class.st
@@ -0,0 +1,109 @@
+Class {
+	#name : 'MicFigureCaptionChecker',
+	#superclass : 'MicChecker',
+	#instVars : [
+		'checkFigure',
+		'checkCode',
+		'checkMath'
+	],
+	#category : 'Microdown-BookTester',
+	#package : 'Microdown-BookTester'
+}
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkCaptionOf: aBlock [
+	(self hasCorrectCaption: aBlock caption) ifFalse: [ 
+		self results add: MicMissingFigureCaptionResult new ]
+]
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkCode [
+
+	^ checkCode
+]
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkCode: anObject [
+
+	checkCode := anObject
+]
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkFigure [
+
+	^ checkFigure
+]
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkFigure: anObject [
+
+	checkFigure := anObject
+]
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkMath [
+
+	^ checkMath
+]
+
+{ #category : 'accessing' }
+MicFigureCaptionChecker >> checkMath: anObject [
+
+	checkMath := anObject
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> checkMissingCaptionIn: aBlock text: captionText [
+	(captionText isEmpty or: [ (captionText anySatisfy: #isAlphaNumeric) not ]) ifTrue: [ 
+		self results add: (MicMissingFigureCaptionResult new
+			figure: aBlock; 
+			yourself) ]
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> configureFrom: aDictionary [
+	super configureFrom: aDictionary.
+	aDictionary at: 'checkOnly' ifPresent: [ :list | 
+		self checkCode: false.
+		self checkFigure: false.
+		self checkMath: false.
+		(list includes: 'code') ifTrue: [ self checkCode: true ].
+		(list includes: 'figure') ifTrue: [ self checkFigure: true ].
+		(list includes: 'math') ifTrue: [ self checkMath: true ] ]
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> explanationForConfiguration [
+	^ 'I check that figures, math environments and code blocks have a valid and non-empty caption.'
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> hasCorrectCaption: aCaptionText [
+    ^ aCaptionText isNotEmpty and: [ aCaptionText anySatisfy: #isAlphaNumeric ]
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> initialize [
+	super initialize.
+	self checkCode: true.
+	self checkFigure: true.
+	self checkMath: true.
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> visitCode: aCode [
+	self checkCode ifTrue: [ self checkCaptionOf: aCode ].
+	^ super visitCode: aCode
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> visitFigure: aFigure [
+	self checkFigure ifTrue: [ self checkCaptionOf: aFigure ].
+	^ super visitFigure: aFigure
+]
+
+{ #category : 'visiting - inline elements' }
+MicFigureCaptionChecker >> visitMath: aMath [
+	self checkMath ifTrue: [ self checkCaptionOf: aMath ].
+	^ super visitMath: aMath
+]
diff --git a/src/Microdown-BookTester/MicFigureCaptionCheckerTest.class.st b/src/Microdown-BookTester/MicFigureCaptionCheckerTest.class.st
new file mode 100644
index 000000000..4eafee8c4
--- /dev/null
+++ b/src/Microdown-BookTester/MicFigureCaptionCheckerTest.class.st
@@ -0,0 +1,119 @@
+Class {
+	#name : 'MicFigureCaptionCheckerTest',
+	#superclass : 'TestCase',
+	#instVars : [
+		'results'
+	],
+	#category : 'Microdown-BookTester',
+	#package : 'Microdown-BookTester'
+}
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testCaptionIsEmpty [
+	| visitor mdFile mem |
+	mem := FileSystem memory root.
+	mdFile := mem / 'test.md'.
+	mdFile writeStreamDo: [ :stream | stream nextPutAll: '![](/fig.png)' ].
+	
+	visitor := MicFigureCaptionChecker new.
+	visitor rootDirectory: mem.
+	visitor checkProject: mdFile. 
+	
+	self assert: visitor results size equals: 1.
+	self assert: visitor results first class name equals: #MicMissingFigureCaptionResult.
+]
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testCaptionIsOnlyPunctuationAndSpaces [
+	| visitor mdFile mem |
+	mem := FileSystem memory root.
+	mdFile := mem / 'test.md'.
+	mdFile writeStreamDo: [ :stream | stream nextPutAll: '![ , ; ](/fig.png)' ].
+	
+	visitor := MicFigureCaptionChecker new.
+	visitor rootDirectory: mem.
+	visitor checkProject: mdFile.
+	
+	self assert: visitor results size equals: 1.
+	self assert: visitor results first class name equals: #MicMissingFigureCaptionResult.
+]
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testCaptionIsOnlySpaces [
+	| visitor mdFile mem |
+	mem := FileSystem memory root.
+	mdFile := mem / 'test.md'.
+	mdFile writeStreamDo: [ :stream | stream nextPutAll: '![   	 ](/fig.png)' ].
+	visitor := MicFigureCaptionChecker new.
+	visitor rootDirectory: mem.
+	visitor checkProject: mdFile.
+	
+	self assert: visitor results size equals: 1.
+]
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testCaptionIsValid [
+	| visitor mdFile mem |
+	mem := FileSystem memory root.
+	mdFile := mem / 'test.md'.
+	mdFile writeStreamDo: [ :stream | stream nextPutAll: '![Une vraie légende](fig.png)' ].
+	
+	visitor := MicFigureCaptionChecker new.
+	visitor rootDirectory: mem.
+	visitor checkProject: mdFile.
+	
+	self assert: visitor results isEmpty.
+]
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testCodeBlockCaptionIsOnlySpaces [
+	| visitor mdFile mem |
+	mem := FileSystem memory root.
+	mdFile := mem / 'bogusCaption.md'.
+	mdFile writeStreamDo: [ :stream | 
+		stream nextPutAll: '```smalltalk&caption=   '; cr.
+		stream nextPutAll: '1 + 1'; cr.
+		stream nextPutAll: '```' ].
+	
+	visitor := MicFigureCaptionChecker new.
+	visitor rootDirectory: mem.
+	visitor checkProject: mdFile.
+	
+	self assert: visitor results size equals: 1.
+]
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testConfigureFromCheckOnly [
+	| checker config |
+	checker := MicFigureCaptionChecker new.
+	
+	self assert: checker checkCode.
+	self assert: checker checkFigure.
+	self assert: checker checkMath.
+	
+	config := Dictionary new.
+	config at: 'checkOnly' put: #('code' 'math').
+	
+	checker configureFrom: config.
+	
+	self assert: checker checkCode.
+	self assert: checker checkMath.
+	self deny: checker checkFigure.
+]
+
+{ #category : 'tests' }
+MicFigureCaptionCheckerTest >> testMathBlockCaptionIsEmpty [
+	| visitor mdFile mem |
+	mem := FileSystem memory root.
+	mdFile := mem / 'emptyCaption.md'.
+	mdFile writeStreamDo: [ :stream | 
+		stream nextPutAll: '$$&caption='; cr.
+		stream nextPutAll: 'V = \frac{4}{3}\pi r^3'; cr.
+		stream nextPutAll: '$$' ].
+	
+	visitor := MicFigureCaptionChecker new.
+	visitor rootDirectory: mem.
+	visitor checkProject: mdFile.
+	
+	self assert: visitor results size equals: 1.
+]
diff --git a/src/Microdown-BookTester/MicMissingFigureCaptionResult.class.st b/src/Microdown-BookTester/MicMissingFigureCaptionResult.class.st
new file mode 100644
index 000000000..efacc897f
--- /dev/null
+++ b/src/Microdown-BookTester/MicMissingFigureCaptionResult.class.st
@@ -0,0 +1,19 @@
+Class {
+	#name : 'MicMissingFigureCaptionResult',
+	#superclass : 'MicResult',
+	#instVars : [
+		'figure'
+	],
+	#category : 'Microdown-BookTester',
+	#package : 'Microdown-BookTester'
+}
+
+{ #category : 'accessing' }
+MicMissingFigureCaptionResult >> figure [
+	^ figure
+]
+
+{ #category : 'accessing' }
+MicMissingFigureCaptionResult >> figure: aFigure [
+	figure := aFigure
+]
diff --git a/src/Microdown/MicFigureBlock.class.st b/src/Microdown/MicFigureBlock.class.st
index b100f286a..8dd4a8b00 100644
--- a/src/Microdown/MicFigureBlock.class.st
+++ b/src/Microdown/MicFigureBlock.class.st
@@ -40,6 +40,11 @@ MicFigureBlock >> altText [
 	^ (self children collect: #plainText) joinUsing: ' '
 ]
 
+{ #category : 'accessing' }
+MicFigureBlock >> caption [
+	^ ' ' join: (self captionElements collect: [ :each | each text ])
+]
+
 { #category : 'visiting' }
 MicFigureBlock >> closeMe [