diff --git a/extension/_test/footnote.txt b/extension/_test/footnote.txt
index 34cb5c0..9b06721 100644
--- a/extension/_test/footnote.txt
+++ b/extension/_test/footnote.txt
@@ -48,3 +48,21 @@ This[^3] is[^1] text with footnotes[^2].
 </ol>
 </section>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
+
+
+5
+//- - - - - - - - -//
+test![^1]
+
+[^1]: footnote
+//- - - - - - - - -//
+<p>test<sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup></p>
+<section class="footnotes" role="doc-endnotes">
+<hr>
+<ol>
+<li id="fn:1" role="doc-endnote">
+<p>footnote <a href="#fnref:1" class="footnote-backref" role="doc-backlink">&#x21a9;&#xfe0e;</a></p>
+</li>
+</ol>
+</section>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
diff --git a/extension/footnote.go b/extension/footnote.go
index 592d7f4..ede72db 100644
--- a/extension/footnote.go
+++ b/extension/footnote.go
@@ -114,12 +114,17 @@ func NewFootnoteParser() parser.InlineParser {
 }
 
 func (s *footnoteParser) Trigger() []byte {
-	return []byte{'['}
+	// footnote syntax probably conflict with the image syntax.
+	// So we need trigger this parser with '!'.
+	return []byte{'!', '['}
 }
 
 func (s *footnoteParser) Parse(parent gast.Node, block text.Reader, pc parser.Context) gast.Node {
 	line, segment := block.PeekLine()
 	pos := 1
+	if len(line) > 0 && line[0] == '!' {
+		pos++
+	}
 	if pos >= len(line) || line[pos] != '^' {
 		return nil
 	}