diff --git a/ada/documentation.py b/ada/documentation.py
index 73794a5b5..4d39a5401 100644
--- a/ada/documentation.py
+++ b/ada/documentation.py
@@ -158,7 +158,7 @@
     """,
     'libadalang.gpr_project_create_preprocessor': """
         Create preprocessor data from compiler arguments found in the given GPR
-        project ``Self`` (``-gnateP`` and ``-gnateD`` compiler switches), or
+        project ``Self`` (``-gnatep`` and ``-gnateD`` compiler switches), or
         from the ``Project`` sub-project (if the argument is passed).
 
         If ``Line_Mode`` is not null, use it to force the line mode in each
diff --git a/extensions/python b/extensions/python
index 17f8ac7c3..a2a267a2f 100644
--- a/extensions/python
+++ b/extensions/python
@@ -291,7 +291,7 @@ class GPRProject:
     ) -> FileReader:
         """
         Create preprocessor data from compiler arguments found in the given GPR
-        project (``-gnateP`` and ``-gnateD`` arguments), or from the
+        project (``-gnatep`` and ``-gnateD`` arguments), or from the
         ``project`` sub-project (if the argument is passed).
 
         Note that this function collects all arguments and returns an
diff --git a/extensions/src/libadalang-implementation-c-extensions.ads b/extensions/src/libadalang-implementation-c-extensions.ads
index cdfe51d26..ea8f903fe 100644
--- a/extensions/src/libadalang-implementation-c-extensions.ads
+++ b/extensions/src/libadalang-implementation-c-extensions.ads
@@ -150,7 +150,7 @@ package Libadalang.Implementation.C.Extensions is
       Line_Mode : access int) return ada_file_reader
    with Export, Convention => C;
    --  Create preprocessor data from compiler arguments found in the given GPR
-   --  project ``Self`` (``-gnateP`` and ``-gnateD`` compiler switches), or
+   --  project ``Self`` (``-gnatep`` and ``-gnateD`` compiler switches), or
    --  from the ``Project`` sub-project (if the argument is passed).
    --
    --  If ``Line_Mode`` is not null, use it to force the line mode in each
diff --git a/extensions/src/libadalang-preprocessing.ads b/extensions/src/libadalang-preprocessing.ads
index b023217e1..ff17fa47a 100644
--- a/extensions/src/libadalang-preprocessing.ads
+++ b/extensions/src/libadalang-preprocessing.ads
@@ -300,7 +300,7 @@ package Libadalang.Preprocessing is
      (Tree    : Prj.Project_Tree'Class;
       Project : Prj.Project_Type := Prj.No_Project) return Preprocessor_Data;
    --  Create preprocessor data from compiler arguments found in the given GPR
-   --  project (``-gnateP`` and ``-gnateD`` arguments).
+   --  project (``-gnatep`` and ``-gnateD`` arguments).
    --
    --  If a non-null ``Project`` is given, look for compiler arguments in it
    --  and the other projects in its closure.  If ``Project`` is left to