diff --git a/R_Programming/Matrices_and_Data_Frames/lesson b/R_Programming/Matrices_and_Data_Frames/lesson.yaml
similarity index 100%
rename from R_Programming/Matrices_and_Data_Frames/lesson
rename to R_Programming/Matrices_and_Data_Frames/lesson.yaml
diff --git a/R_Programming/Missing_Values/lesson b/R_Programming/Missing_Values/lesson.yaml
similarity index 100%
rename from R_Programming/Missing_Values/lesson
rename to R_Programming/Missing_Values/lesson.yaml
diff --git a/R_Programming/Subsetting_Vectors/lesson b/R_Programming/Subsetting_Vectors/lesson.yaml
similarity index 100%
rename from R_Programming/Subsetting_Vectors/lesson
rename to R_Programming/Subsetting_Vectors/lesson.yaml