diff --git a/java/ql/lib/semmle/code/java/regex/RegexTreeView.qll b/java/ql/lib/semmle/code/java/regex/RegexTreeView.qll
index c0711bb7fdc..cb770ffe48a 100644
--- a/java/ql/lib/semmle/code/java/regex/RegexTreeView.qll
+++ b/java/ql/lib/semmle/code/java/regex/RegexTreeView.qll
@@ -561,6 +561,15 @@ module Impl implements RegexTreeViewSig {
     }
   }
 
+  /**
+   * A character escape in a regular expression.
+   *
+   * Example:
+   *
+   * ```
+   * \.
+   * ```
+   */
   class RegExpCharEscape = RegExpEscape;
 
   /**
diff --git a/python/ql/lib/semmle/python/RegexTreeView.qll b/python/ql/lib/semmle/python/RegexTreeView.qll
index cdc1ca3adc2..a05ee87e6a7 100644
--- a/python/ql/lib/semmle/python/RegexTreeView.qll
+++ b/python/ql/lib/semmle/python/RegexTreeView.qll
@@ -457,6 +457,15 @@ module Impl implements RegexTreeViewSig {
     override string getPrimaryQLClass() { result = "RegExpAlt" }
   }
 
+  /**
+   * A character escape in a regular expression.
+   *
+   * Example:
+   *
+   * ```
+   * \.
+   * ```
+   */
   class RegExpCharEscape = RegExpEscape;
 
   /**
diff --git a/ruby/ql/lib/codeql/ruby/regexp/RegExpTreeView.qll b/ruby/ql/lib/codeql/ruby/regexp/RegExpTreeView.qll
index b11efbdd268..38d5de5d33a 100644
--- a/ruby/ql/lib/codeql/ruby/regexp/RegExpTreeView.qll
+++ b/ruby/ql/lib/codeql/ruby/regexp/RegExpTreeView.qll
@@ -539,6 +539,15 @@ private module Impl implements RegexTreeViewSig {
     override predicate isNullable() { this.getAChild().isNullable() }
   }
 
+  /**
+   * A character escape in a regular expression.
+   *
+   * Example:
+   *
+   * ```
+   * \.
+   * ```
+   */
   class RegExpCharEscape = RegExpEscape;
 
   /**