diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b75c72c7..15cd2ea6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -4,11 +4,14 @@ on: [push, pull_request]
 
 jobs:
   test_python:
-    runs-on: ${{matrix.os}}
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.7", "3.8", "3.9", "3.10"]
+        exclude:
+          - os: macos-latest
+            python-version: "3.7"
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
@@ -25,7 +28,7 @@ jobs:
           python -m unittest discover -v --start-directory tests/python --pattern "bindings_test*.py"
   
   test_cpp:
-    runs-on: ${{matrix.os}}
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
diff --git a/README.md b/README.md
index 6eefcf20..b0f015a9 100644
--- a/README.md
+++ b/README.md
@@ -25,8 +25,8 @@ Full list of changes: https://github.com/nmslib/hnswlib/pull/523
 ### Highlights:
 1) Lightweight, header-only, no dependencies other than C++ 11
 2) Interfaces for C++, Python, external support for Java and R (https://github.com/jlmelville/rcpphnsw).
-3) Has full support for incremental index construction and updating the elements. Has support for element deletions 
-(by marking them in index). Index is picklable.
+3) Has full support for incremental index construction and updating the elements (thanks to the contribution by Apoorv Sharma). Has support for element deletions 
+(by marking them in index, later can be replaced with other elements). Python index is picklable.
 4) Can work with custom user defined distances (C++).
 5) Significantly less memory footprint and faster build time compared to current nmslib's implementation.