diff --git a/sv-parser-pp/src/preprocess.rs b/sv-parser-pp/src/preprocess.rs
index 1c37adb..4db5ba6 100644
--- a/sv-parser-pp/src/preprocess.rs
+++ b/sv-parser-pp/src/preprocess.rs
@@ -1329,6 +1329,23 @@ mod tests {
         assert_eq!(format!("{:?}", ret), "Err(IncludeLine)");
     } // }}}
 
+    #[test]
+    fn keywords() { // {{{
+        let include_paths = [testfile_path("")];
+        let (ret, _) = preprocess(
+            testfile_path("keywords.sv"),
+            &HashMap::new(),
+            &include_paths,
+            false,
+            false,
+        )
+        .unwrap();
+        assert_eq!(
+            ret.text(),
+            testfile_contents("keywords.sv")
+        );
+    } // }}}
+
     #[test]
     fn macro_arguments() { // {{{
         let (ret, _) = preprocess(
diff --git a/sv-parser-pp/testcases/keywords.sv b/sv-parser-pp/testcases/keywords.sv
new file mode 100644
index 0000000..f053565
--- /dev/null
+++ b/sv-parser-pp/testcases/keywords.sv
@@ -0,0 +1,50 @@
+// IEEE1800-2017 Clause 22.14
+// A pair of directives, `begin_keywords and `end_keywords, can be used to
+// specify what identifiers are reserved as keywords within a block of source
+// code, based on a specific version of IEEE Std 1364 or IEEE Std 1800.
+// The `begin_keywords and `end_keywords directives only specify the set of
+// identifiers that are reserved as keywords. The directives do not affect the
+// semantics, tokens, and other aspects of the SystemVerilog language.
+// The `begin_keywords and `end_keywords directives can only be specified
+// outside a design element. The `begin_keywords directive affects all source
+// code that follows the directive, even across source code file boundaries,
+// until the matching `end_keywords directive or the end of the compilation
+// unit. The results of these directives are not affected by the `resetall
+// directive.
+`begin_keywords "1800-2017"
+`end_keywords
+`begin_keywords "1800-2012"
+`end_keywords
+`begin_keywords "1800-2009"
+`end_keywords
+`begin_keywords "1800-2005"
+`end_keywords
+`begin_keywords "1364-2005"
+`end_keywords
+`begin_keywords "1364-2001"
+`end_keywords
+`begin_keywords "1364-2001-noconfig"
+`end_keywords
+`begin_keywords "1364-1995"
+`end_keywords
+// The `begin_keywords `end_keywords directive pair can be nested. Each nested
+// pair is stacked so that when an `end_keywords directive is encountered, the
+// implementation returns to using the version_ specifier that was in effect
+// prior to the matching `begin_keywords directive.
+`begin_keywords "1800-2017"
+`begin_keywords "1800-2012"
+`begin_keywords "1800-2009"
+`begin_keywords "1800-2005"
+`begin_keywords "1364-2005"
+`begin_keywords "1364-2001"
+`begin_keywords "1364-2001-noconfig"
+`begin_keywords "1364-1995"
+`end_keywords
+`end_keywords
+`end_keywords
+`end_keywords
+`end_keywords
+`end_keywords
+`end_keywords
+`end_keywords
+// This file should be emitted from the preprocessor unchanged.