diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/inspectionProfiles/profiles_settings.xml b/.idea/inspectionProfiles/profiles_settings.xml
new file mode 100644
index 0000000..105ce2d
--- /dev/null
+++ b/.idea/inspectionProfiles/profiles_settings.xml
@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <settings>
+    <option name="USE_PROJECT_PROFILE" value="false" />
+    <version value="1.0" />
+  </settings>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..0b6c7d1
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.9 (scrapy)" project-jdk-type="Python SDK" />
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..dfc4250
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/ply.iml" filepath="$PROJECT_DIR$/.idea/ply.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/ply.iml b/.idea/ply.iml
new file mode 100644
index 0000000..8b8c395
--- /dev/null
+++ b/.idea/ply.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+  <component name="PyDocumentationSettings">
+    <option name="format" value="PLAIN" />
+    <option name="myDocStringFormat" value="Plain" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/doc/ply.md b/doc/ply.md
index da6665c..86135e3 100644
--- a/doc/ply.md
+++ b/doc/ply.md
@@ -51,7 +51,7 @@ language syntax that has been specified in the form of a context free
 grammar.
 
 The two tools are meant to work together. Specifically, `lex.py`
-provides an interface to produce tokens. `yacc.py` uses this retrieve
+provides an interface to produce tokens. `yacc.py` uses this to retrieve
 tokens and invoke grammar rules. The output of `yacc.py` is often an
 Abstract Syntax Tree (AST). However, this is entirely up to the user. If
 desired, `yacc.py` can also be used to implement simple one-pass
@@ -69,7 +69,7 @@ PLY relies on reflection (introspection) to build its lexers and
 parsers. Unlike traditional lex/yacc which require a special input file
 that is converted into a separate source file, the specifications given
 to PLY *are* valid Python programs. This means that there are no extra
-source files nor is there a special compiler construction step (e.g.,
+source files, nor is there a special compiler construction step (e.g.,
 running yacc to generate Python code for the compiler).
 
 ## Lex